|Publication number||US7908332 B2|
|Application number||US 12/245,406|
|Publication date||Mar 15, 2011|
|Filing date||Oct 3, 2008|
|Priority date||Nov 30, 2000|
|Also published as||US7003551, US7444382, US20020065892, US20060095527, US20090030997|
|Publication number||12245406, 245406, US 7908332 B2, US 7908332B2, US-B2-7908332, US7908332 B2, US7908332B2|
|Inventors||Dale W. Malik|
|Original Assignee||At&T Intellectual Property I, L.P.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (71), Non-Patent Citations (34), Referenced by (8), Classifications (8), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a continuation of co-pending U.S. utility application Ser. No. 11/303,839, filed Dec. 16, 2005, which is a continuation of Ser. No. 09/725,719, filed Nov. 30, 2000 and issued as U.S. Pat. No. 7,003,551.
The present invention relates to the storage and maintenance of e-mail attachment files in an e-mail communications server, and more particularly, to a method and apparatus for reducing the number of copies of identical attachment files stored in the e-mail communications server.
During the past decade, electronic mail (“e-mail”) has become an indispensable tool for facilitating business and personal communications. Through computer networking systems such as local-area networks (“LAN”), wide-area networks (“WAN”), and the world-wide web (“WWW”), network users can send and receive notes, messages, letters, etc., to communicate with others who are in the same office or perhaps in remote locations across the world.
E-mail application programs are typically configured for generating messages in the form of memoranda. An e-mail application user interface guides a user to “compose” an e-mail communication by providing a platform for entering at least one outgoing e-mail address, a “subject” heading, and a “body” for the actual message. The user may also designate a document, file or executable program to be attached to the e-mail message. When the user completes typing the message and presses the “send” key, the message is transmitted over the network and is routed for delivery to an e-mail server corresponding to the provided destination address.
A known e-mail communications system and a method for transmitting e-mail communications between networks over the Internet are described with reference to
When an e-mail communication is transmitted according to the Simple Mail Transport Protocol (SMTP), it is first divided into three components: the sender's “mail from:” address; the recipient address list; and the data portion of the message. After a user of computer 10 c prepares an e-mail communication and sends the e-mail across the LAN 11, it is sent to the MTA 12 a, which accepts e-mails for delivery. The MTA then separates the address information from the data portion of the e-mail. The MTA parses the envelope to determine whether to route the message to an external network or store the message in Message Store 12 c for access by another computer connected to the LAN 11. The MTA “postmarks” the e-mail by adding routing data to the header before storing the message.
If the e-mail is to be sent to another user on a different mail system, the MTA 12 next determines the domain for the intended recipient through its DNS 13, which queries the recipient system's DNS 15 through the Internet. Upon receiving the domain information, MTA 12 a transmits the e-mail communication to MTA 16 b, which is waiting to accept e-mail. MTA 16 b then stores the received e-mail in Message Store 16 c. Later, a user on computer 18 a can log in to the e-mail system and connect to the POP server 16 a, which determines if there is new mail to download. POP server 16 a can then retrieve the e-mail communication from the Message Store 16 c and transmit the e-mail through the LAN 17 to the user.
It is common for users to send a single e-mail communication to multiple recipients. This typically occurs when the e-mail communication contains a humorous joke or anecdote, a political announcement or notice, an advertisement, or pertains to any other subject matter that is of common interest. Some of the recipients may in turn forward this e-mail communication to other groups of recipients. In some instances, a single e-mail communication ultimately may be transmitted and forwarded to thousands of recipients, and, through different sources, some users may even receive multiple copies of the same e-mail communication. Such e-mail communications may additionally include large attachment files stored along with the e-mail message.
When an e-mail communication is transmitted to a plurality of recipients who are connected to the same e-mail communications server, only a single copy of the e-mail communication message and attachment is stored in the Mail Storage of the e-mail server. For example, if a prospective vendor sends a solicitation via e-mail to a large group of employees in a single company, the company's e-mail server will store only a single copy of the e-mail solicitation. The e-mail message and attachment will remain in the Mail Storage until it is designated for deletion by each of the recipients. Consolidating storage of e-mail communications in this manner can reduce the amount of memory required in the company's e-mail communications server.
Although presently available e-mail communications systems consolidate storage when an e-mail communication transmitted by a single sender is received for distribution to a plurality of recipients in a common e-mail server, such e-mail systems do not consolidate storage of the e-mail communication file when it is forwarded to others in the network, resulting in multiple copies of the same file(s). Likewise, if a common e-mail communication is separately transmitted to multiple recipients in a network, or is transmitted multiple times to a single recipient, the e-mail system retains multiple copies of the same file(s) in Mail Storage. This duplication of file storage reduces the efficiency of the e-mail communications server.
In view of the difficulties described above regarding the duplication of storage of common e-mail communications in an e-mail server, there is a need for a method and apparatus for automatically detecting and consolidating storage of common e-mail attachment files received in an e-mail communications server.
An object of the present invention is to provide a method of storing an e-mail communication containing an attachment file received in an e-mail server. A database of attachment files previously stored in the e-mail server is searched for a copy of the attachment file from the received e-mail communication. If a copy of the attachment file is located in the e-mail server, the attachment file from the e-mail communication is removed, and a link is created from the e-mail communication to the previously stored attachment file in the database.
Another object of the present invention is to provide a method of storing attachment files to e-mail communications received in an e-mail server. Header information from the e-mail communications is extracted and stored in a mail store. Header information from the attachment file to be stored is also extracted. The extracted attachment file header information is compared with header information from attachment files previously stored in the mail store to determine whether the attachment files received with the e-mail communications are duplicates of previously stored files. If an attachment file is a duplicate, a link is stored in the mail store between the e-mail header information and the previously stored attachment file.
Yet another object of the present invention is to provide an e-mail communications server. An MTA server receives e-mail communications from an external network. A mail store stores e-mail communications received by the MTA server. A POP server downloads e-mail communications from the mail store to client computers through an internal network. E-mail attachment file checking software determines whether attachment files in received e-mail communications are duplicates of attachment files in the mail store. The mail store then removes duplicate attachment files from e-mail communications and creates links from received e-mail communications to the corresponding attachment files in the mail store.
The present invention provides an e-mail communications system that minimizes the number of duplicate copies of common attachment files to e-mail communications that are stored in the mail store of an e-mail server. When the e-mail server receives an e-mail attachment file that is larger than a threshold size, the server performs a database search for another copy of the attachment file in the mail store. If another copy is located, the system creates a pointer in the mail store that associates the located attachment file with the e-mail for the additional recipient(s). An attachment file is deleted only after all e-mail communications that include the attachment file are deleted.
The present invention will now be described in more detail with reference to the figures.
Mail store 23 contains an attachment file storage database 28 for storing attachment files from e-mail communications received from the MTA 22. The attachment files are stored separately from the corresponding e-mail header information and message, which are maintained in a header database 27. For each e-mail communication received by the MTA 22 that includes at least one attachment file, the header database 27 stores at least one link to the corresponding attachment file(s) in the attachment file storage database 28. As explained in further detail below, detected attachment files that are referenced by multiple e-mail communications are stored in a common attachment section 29 a, separate from the storage of other attachment files 29 b. Much like a cache, the common attachment section 29 a stores files that are accessed more frequently in the attachment file database 28.
If the MTA server determines in step 32 that an attachment file is included in the e-mail communication, the size checker software 25 in the duplication checker 24 determines the attachment file size in step 34. If it is determined in step 35 that the attachment file is not greater than a threshold size, the mail store in step 39 stores the header and message information (depending upon configuration) in the header database 27. In step 40, the attachment file is then stored in the main section 29 b of the attachments file storage database 28. A link is created in the header database from the header to the stored attachment file. In the e-mail server 20 of the preferred embodiment, all attachment files, regardless of size, are stored in the attachment file storage database, and the header database 27 creates a link from the corresponding e-mail header to the attachment. In the alternative embodiment in which the e-mail message is stored in an e-mail database in the mail store 23, the attachment file may also be stored in the e-mail database together with the e-mail message.
The duplication checker of the preferred embodiment is configured to reduce the number of duplicate attachment files that are greater than a certain, predetermined threshold size. As will be described, the steps of processing the attachment file prior to storage, searching the attachment file database for duplicates, and moving files from the main section 29 b to the cached common attachments portion 29 a of the attachment files database are time intensive. Attachment files of a relatively small size, such as those below 50 KB, do not occupy significant space in the attachment file storage database, even if multiple copies have been received and stored therein. Therefore, attachments that are relatively small text files, such as short letters or memoranda, are not searched for duplicates. In contrast, large attachment files, such as those above 1 MB (or any other pre-determined threshold), can require significant resources when multiple copies are stored in the e-mail server. An inordinate number of duplicates of large attachment files stored in the e-mail server may overfill the server, such that the e-mail communications server will cease operating until files are deleted. For this reason, information systems managers who operate conventional e-mail communications systems caution users to promptly delete large e-mails and discourage others from sending e-mails with large attachment files to the e-mail server.
If, in step 35, size checker 25 in the e-mail server 20 determines that an e-mail attachment in a received e-mail communication is greater than a threshold size, the duplication checker 24 next processes the attachment file in step 36 to generate file identification information. As will be described in further detail below, this can be performed by any of several methods, such as a checksum determination, or extraction of certain attachment file header information. The processing step generates information by which the attachment file comparison section 26 of the duplication checker 24 can search the attachment file storage database 28 for identical attachment files, in step 37.
If the duplication checker determines, in step 38, that there are no copies of the attachment file previously stored in the mail store 23, then the mail store stores the attachment file in the main section 29 b in step 39, and creates a record in the header database and a link in the record from the attachments database to the header database, in step 40.
If the duplication checker locates another copy of the attachment file, the mail store 23 checks in step 41 if the attachment file is presently stored in the cache portion 29 a of the attachment file storage database 28. However, if the duplication checker determines that the attachment file is in the cache portion 29 a, then the attachment file is already associated with a plurality of e-mail communications. In that case, the mail store creates a link in the record of the header database to the attachment in the cache portion 29 a in step 44.
If the attachment file is not presently in the cache portion 29 a, then the attachment file has thus far been associated with only a single e-mail communication. In step 42, the attachment file is transferred from main section of the database 29 b to the cache portion 29 a. The links in the record of the other, previously stored e-mail communication associated with the attachment file is modified to reflect the change in storage location in step 43. The mail store then creates a link in the record of the header database to the attachment in the cache portion 29 a in step 44.
In the preferred embodiment, as shown in
The process of searching the attachment file storage database 37 for a duplicate of the attachment file to be stored in the mail store indicated by step 37 of
According to the preferred embodiment, the duplication checker 24 first identifies the type of file that is to be stored as an attachment to an e-mail communication. For example, an attachment file may be a text, spreadsheet, graphics, picture, audio, or video file. By searching first according to the type of file, the duplication checker can immediately eliminate the majority of files stored in the mail store from consideration. The duplication checker next identifies the properties associated with the attachment file in the file header, which may include any of: title/name, MS-DOS name, software program, software program version number, author, creation date/time, last modified date/time, size, attributes, last saved by, revision number, and revision time (minutes). In the case of a text document, such as a Microsoft Word™ document, other properties might include the number of sections, pages, paragraphs, lines, words, and characters. A Microsoft PowerPoint™ document may include properties such as the type of fonts used, design template, embedded OLE servers, and slide titles.
The duplication checker searches the properties of each attachment file in the database that is of the same type as the application file in the received e-mail communication. If another attachment file has the identical properties, the attachment file in the received e-mail is identified as being a duplicate.
Because the attachment file in the received e-mail communication is greater than the threshold size of 0.5 MB, the duplication checker 24 processes the attachment file in the e-mail communication for file identification. Looking to header of the attachment file, the duplication checker identifies that the attachment is a video file, entitled “Whassup,” playable on Real Audio™, version 2.0, created on Oct. 6, 2000, authored by “Spike.”
The duplication checker 24 now performs a search of the attachment file database for common attachment files. Searching the cached attachment file of
Comparing this file to the attachment file in the e-mail, it becomes evident that the title, size, software and version, author, and creation date are the same. Based upon these common properties, it is determined that the attachment file in the e-mail communication for email@example.com is a duplicate. It is worth noting that the subject headings for the e-mails stored as header numbers 1, 5, and 6 are each different, and header number 5 was received on a different date from a different source than headers 1 and 6. The duplicate server and mail store can detect that the attachment files are duplicates by storing the attachment file separately from the corresponding e-mails.
Because the file is already in the cache portion of the database, there is no need to move the attachment file from the main attachment file storage database 29 b to the cache 29 a. The mail store 23 creates a new link and header record in the header database of
The steps for retrieving e-mail from the e-mail server by a client computer are now described with reference to
If the POP server detects in step 64 that the client requests to delete the e-mail communication, the header in the mail store corresponding to the received e-mail communication is deleted from the header database in step 66. The header reference number is then deleted in step 67 from the corresponding attachment file in the attachment file storage database. The mail store then checks in step 68 if any header reference numbers for the attachment file remain in the attachment database. If all e-mail recipients have deleted the e-mail communication, then the attachment file is deleted from the attachment database, in step 70.
Accordingly, the duplication checker and mail store header and attachment databases of the present invention can minimize storage of duplicate attachment files in an e-mail communications system. The e-mail server of the present invention is configured such that duplicate copies of attachment files are not unnecessarily stored in the mail store, whether the attachment files are received through separate e-mails or e-mail forwarding by users within the same e-mail server network. Thus, it is readily seen that the method and system of the present invention provides for improved and efficient e-mail communications, and saves valuable memory space in the mail store of an e-mail server.
The foregoing disclosure of embodiments of the present invention and specific examples illustrating the present invention have been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many variations and modifications of the embodiments described herein will be obvious to one of ordinary skill in the art in light of the above disclosure. The scope of the invention is to be defined only by the claimed appended hereto, and by their equivalents.
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|International Classification||G06Q10/10, H04L12/58, G06F15/16|
|Cooperative Classification||H04L51/08, G06Q10/107|
|European Classification||H04L12/58, G06Q10/107|
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